American Society of Plant Taxonomists
Promoting research and teaching of taxonomy, systematics, and phylogeny of vascular and nonvascular plants. Membership directory allow searching by plant specialty.
An index of the world's herbaria, their staff, contact information, statistics, important collections and publications.
Index Nominum Genericorum
An index initiated in 1954 as a compilation of generic names published for all organisms covered by the International Code of Botanical Nomenclature.